code: def test_list_fileset_files(self, get_operation_processor):
      processor = MagicMock()
      get_operation_processor.return_value = processor
  
      with self._exp() as exp:
          path = self._random_path()
          var = FileSet(exp, path)
          file_entries = var.list_fileset_files()
  
          assert isinstance(file_entries, list)
          assert len(file_entries) == 1
  
file_path: neptune-client/tests/unit/neptune/new/attributes/sets/test_file_set.py
imports: import os
  from mock import MagicMock, patch
  from neptune.attributes.file_set import FileSet
  from neptune.internal.operation import DeleteFiles, UploadFileSet
  from tests.unit.neptune.new.attributes.test_attribute_base import TestAttributeBase
label_desc: Use image node_id 4 for calling the TestFileSet obj's underlying member method code with example usage: obj.test_list_fileset_files(get_operation_processor) without return types